How much more accurate is RFID than barcode?2020-05-19T09:03:42+00:00

It is estimated that barcode technology is between 68-80% accurate. RFID on the other hand is estimated to be above 98% accurate.

What is the difference between Source Tagging and On-Demand Tagging?2020-05-19T09:03:20+00:00

Source tagging is applying labels to product at the “source” such as a manufacturing facility. Many companies who Source Tag use Service Bureaus to print the needed labels and ship them to the location applying the labels. On-Demand tagging is tagging product upon receipt of goods. Many companies who use the On-Demand Tagging approach use suppliers instead of manufacturing their own items. Due to the many suppliers and shorter lead time these retailers lack the sufficient lead-time to use a Service Bureau and therefore must print and apply their tags when items arrive.

How are RFID tags printed?2020-05-19T09:02:57+00:00

RFID tags are printed from a printer–much like any standard label printer. These printers however are RFID enabled which allows them to print the user’s desired text and barcode to the label, while simultaneously encoding the serial number into the tag’s chip.

Will RFID lead to massive layoffs of workers?2020-05-19T09:02:30+00:00

RFID technology is a labor-saving technology so it’s likely that some workers will laid off. That’s because fewer workers will be needed to scan bar codes. But the transition from barcodes to RFID could take a decade or more, so it is unlikely that RFID will lead to wide-scale displacement of workers. The technology will likely create new jobs, just as Internet technologies creating new jobs, from Web developers to warehouse workers managing inventory for online stores such as Amazon.com. The jobs that will be affected by RFID are those that involve scanning bar codes. Most of those jobs also have other components, such as moving products or restocking shelves. Those jobs will not go away because of RFID.

What is “energy harvesting”?2020-05-19T09:02:02+00:00

Most passive RFID tags simply reflect back waves from the reader. Energy harvesting is a technique in which energy from the reader is gathered by the tagged, stored momentarily and transmitted back at a different frequency. This method may improve the performance of passive RFID tags dramatically. (Subscribers, see A New Approach to RFID.)

What are intelligent software agents and how do they fit into RFID?2020-05-19T09:01:37+00:00

Software agents are basically autonomous applications that automate decision making by establishing a set of rules. For instance, if X happens, do Y. They are important to RFID because humans will be overwhelmed by the amount of data coming from RFID tags and the speed at which it comes (real-time in many cases). So agents will likely be used to automate routine decisions and alert employees when a situation requires their attention. SAP and a company called BiosGroup are working on an automated replenishment system in which software agents would make decisions when trends indicate a product will be out of stock. (Subscribers, see Agents Key to RFID Supply Chains.)

I’ve heard RFID can be used with sensors. Is that true?2020-05-19T09:01:11+00:00

Yes. Some companies are combining RFID tags with sensors that detect and record temperature, movement, even radiation. One day, the same tags used to track items moving through the supply chain may also alert staff if they are not stored at the right temperature, if meat has gone bad, or even if someone has injected a biological agent into food. (Subscribers, see RFID Sensors: From Battlefield Intelligence To Consumer Protection.)

Are any companies using RFID today?2020-05-19T09:00:48+00:00

Yes. Thousands of companies around the world use RFID today to improve internal efficiencies. Club Car, a maker of golf carts uses RFID to improve efficiency on its production line (subscribers, see Golf Car Maker Scores with RFID). Paramount Farms—one of the world’s largest suppliers of pistachios—uses RFID to manage its harvest more efficiently (see Farm Harvests RFID’s Benefits). NYK Logistics uses RFID to improve the throughput of containers at its busy Long Beach, Calif., distribution center (see Logistics Gets Cheaper by the Yard). And many other companies are using RFID for a wide variety of applications. (See Case Studies for more examples of how RFID is benefiting companies today.)

What are some of the most common applications for RFID?2020-05-19T09:00:18+00:00

RFID is used for everything from tracking cows and pets to triggering equipment down oil wells. It may sound trite, but the applications are limited only by people’s imagination. The most common applications are tracking goods in the supply chain, reusable containers, high value tools and other assets, and parts moving to a manufacturing production line. RFID is also used for security (including controlling access to buildings and networks) and payment systems that let customers pay for items without using cash.

Who are the leading RFID vendors?2020-05-19T08:59:53+00:00

There are many different RFID vendors with different areas of expertise. RFID Journal has compiled a searchable database and director of vendors around the world. Click on Find a Vendor in the left-hand navigation bar to locate the type of vendor you are looking for.

Are there any standards for RFID?2020-05-19T08:59:30+00:00

Yes. International standards have been adopted for some very specific applications, such as tracking animals. Many other standards initiatives are under way. The International Organization for Standardization (ISO) is working on standards for tracking goods in the supply chain using high-frequency tags (ISO 18000-3) and ultra-high frequency tags (ISO 18000-6). EPCglobal, a joint venture set up to commercialize Electronic Product Code technologies, has its own standards process, which was used to create bar code standards. EPCglobal intends to submit EPC protocols to ISO so that they can become international standards.

What is the read range for a typical RFID tag?2020-05-19T08:59:08+00:00

The read range of passive tags (tags without batteries) depends on many factors: the frequency of operation, the power of the reader, interference from metal objects or other RF devices. In general, low-frequency tags are read from a foot or less. High frequency tags are read from about three feet and UHF tags are read from 10 to 20 feet. Where longer ranges are needed, such as for tracking railway cars, active tags use batteries to boost read ranges to 300 feet or more.

What is tag collision?2020-05-19T08:58:47+00:00

Another problem readers have is reading a lot of chips in the same field. Tag collision occurs when more than one chip reflects back a signal at the same time, confusing the reader. Different vendors have developed different systems for having the tags respond to the reader one at a time. Since they can be read in milliseconds, it appears that all the tags are being read simultaneously.

What is reader collision?2020-05-19T08:58:09+00:00

One problem encountered with RFID is the signal from one reader can interfere with the signal from another where coverage overlaps. This is called reader collision. One way to avoid the problem is to use a technique called time division multiple access, or TDMA. In simple terms, the readers are instructed to read at different times, rather than both trying to read at the same time. This ensures that they don’t interfere with each other. But it means any RFID tag in an area where two readers overlap will be read twice. So the system has to be set up so that if one reader reads a tag another reader does not read it again.

What’s the difference between read-only and read-write tags?2020-05-19T08:57:47+00:00

Microchips in RFID tags can be read-write or read-only. With read-write chips, you can add information to the tag or write over existing information when the tag is within range of a reader, or interrogator. Read-write tags usually have a serial number that can’t be written over. Additional blocks of data can be used to store additional information about the items the tag is attached to. Some read-only microchips have information stored on them during the manufacturing process. The information on such chips can never been changed. Other tags can have a serial number written to it once and then that information can’t be overwritten later.

How much information can the tag store?2020-05-19T08:57:22+00:00

It depends on the vendor and the application, but typically a tag would carry no more than 2KB of data—enough to store some basic information about the item it is on. Companies are now looking at using a simple “license plate” tag that contains only a 96-bit serial number. The simple tags are cheaper to manufacture and are more useful for applications where the tag will be disposed of with the product packaging.

What is an Electronic Product Code?2020-05-19T08:56:55+00:00

The Electronic Product Code, or RFID, was developed by the Auto-ID Center as a successor to the bar code. It is a numbering scheme that will be used to identify products as they move through the global supply chain. Current tag standard are EPC Class 1 Gen 2.

What’s the difference between passive and active tags?2020-05-19T08:56:34+00:00

Active RFID tags have a battery, which is used to run the microchip’s circuitry and to broadcast a signal to a reader (the way a cell phone transmits signals to a base station). Passive tags have no battery. Instead, they draw power from the reader, which sends out electromagnetic waves that induce a current in the tag’s antenna. Semi-passive tags use a battery to run the chip’s circuitry, but communicate by drawing power from the reader. Active and semi-passive tags are useful for tracking high-value goods that need to be scanned over long ranges, such as railway cars on a track, but they cost a dollar or more, making them too expensive to put on low-cost items. Companies are focusing on passive UHF tags, which cost under a 50 cents today in volumes of 1 million tags or more. Their read range isn’t as far — typically less than 20 feet vs. 100 feet or more for active tags — but they are far less expensive than active tags and can be disposed of with the product packaging.

Do all countries use the same low-, high and ultra-high frequencies?2020-05-19T08:56:05+00:00

No. Most countries have assigned the 125 kHz or 134 kHz area of the radio spectrum for low-frequency systems, and 13.56 MHz is used around the world for high-frequency systems. But UHF RFID systems have only been around since the mid-1990s and countries have not agreed on a single area of the UHF spectrum for RFID. Europe uses 868 MHz for UHF and the U.S. uses 915 MHz. Until recently, Japan did not allow any use of the UHF spectrum for RFID, but it is looking to open up the 960MHz area for RFID. Many other devices use the UHF spectrum, so it will take years for all governments to agree on a single UHF band for RFID. Government’s also regulate the power of the readers to limit interference with other devices. Some groups, such as the Global Commerce Initiative, are trying to encourage governments to agree on frequencies and output. Tag and reader makers are also trying to develop systems that can work at more than one frequency, to get around the problem.

How do I know which frequency is right for my application?2020-05-19T08:55:43+00:00

Different frequencies have different characteristics that make them more useful for different applications. For instance, low-frequency tags are cheaper than ultra high frequency (UHF) tags, use less power and are better able to penetrate non-metallic substances. They are ideal for scanning objects with high-water content, such as fruit, at close range. UHF frequencies typically offer better range and can transfer data faster. But they use more power and are less likely to pass through materials. And because they tend to be more “directed,” they require a clear path between the tag and reader. UHF tags might be better for scanning boxes of goods as they pass through a bay door into a warehouse. It is probably best to work with a consultant, integrator or vendor that can help you choose the right frequency for your application.

What is the difference between low-, high-, and ultra-high frequencies?2020-05-19T08:55:19+00:00

Just as your radio tunes into different frequency to hear different channels, RFID tags and readers have to be tuned to the same frequency to communicate. RFID systems use many different frequencies, but generally the most common are low- (around 125 KHz), high- (13.56 MHz) and ultra-high frequency, or UHF (850-900 MHz). Microwave (2.45 GHz) is also used in some applications. Radio waves behave differently at different frequency, so you have to choose the right frequency for the right application.

What is AIDC or Automatic Identification?2016-02-28T18:05:52+00:00

AIDC or Automatic identification and Data Capture, or auto ID for short, is the broad term given to a host of technologies that are used to help machines identify objects. Auto identification is often coupled with automatic data capture. That is, companies want to identify items, capture information about them and somehow get the data into a computer without having employees type it in. The aim of most auto-ID systems is to increase efficiency, reduce data entry errors, and free up staff to perform more value-added functions, such as providing customer service. There are a host of technologies that fall under the auto-ID umbrella. These include bar codes, smart cards, voice recognition, some biometric technologies (retinal scans, for instance), optical character recognition, and radio frequency identification (RFID).

What is RFID?2016-02-28T17:59:02+00:00

Radio frequency identification, or RFID, is a generic term for technologies that use radio waves to automatically identify people or objects. There are several methods of identification, but the most common is to store a serial number that identifies a person or object, and perhaps other information, on a microchip that is attached to an antenna (the chip and the antenna together are called an RFID transponder or an RFID tag). The antenna enables the chip to transmit the identification information to a reader. The reader converts the radio waves reflected back from the RFID tag into digital information that can then be passed on to computers that can make use of it.

How does an RFID system work?2016-02-28T17:57:11+00:00

An RFID system consists of a tag, which is made up of a microchip with an antenna, and an interrogator or reader with an antenna. The reader sends out electromagnetic waves. The tag antenna is tuned to receive these waves. A passive RFID tag draws power from field created by the reader and uses it to power the microchip’s circuits. The chip then modulates the waves that the tag sends back to the reader and the reader converts the new waves into digital data. New mobile readers are able to connect to smartphones and tablets running on apps via Bluetooth. This allows the smartphone or tablet’s’ processor and data connection to process and upload the data to the web. This advancement has allowed systems to be much more mobile and easy to use.

Are there any health risks associated with RFID and radio waves?2016-02-28T00:31:42+00:00

RFID uses the low-end of the electromagnetic spectrum. The waves coming from readers are no more dangerous than the waves coming to your car radio.

Why is RFID better than using bar codes?2016-02-28T00:29:55+00:00

RFID is not necessarily “better” than bar codes. The two are different technologies and have different applications, which sometimes overlap. The big difference between the two is bar codes are line-of-sight technology. That is, a scanner has to “see” the bar code to read it, which means people usually have to orient the bar code towards a scanner for it to be read. Radio frequency identification, by contrast, doesn’t require line of sight. RFID tags can be read as long as they are within range of a reader. Bar codes have other shortcomings as well. If a label is ripped, soiled or falls off, there is no way to scan the item. And standard bar codes identify only the manufacturer and product, not the unique item. This ability to track individual items, as opposed to just SKU level, provides visibility to shrink, expiration dates, and allows visibility to the entire genealogy of the product. The bar code on one milk carton is the same as every other, making it impossible to identify which one might pass its expiration date first. RFID’s shortcomings include tags unable to read due to their chips being damaged and some environmental challenges including metal and water.

How much does RFID help with company shrink?2016-02-28T00:28:15+00:00

Barcode technology helps identify internal shrink between 0.5 and 1%. RFID on the other hand allows companies to see up to 70% shrink. Part of this benefit is realized due frequency of audits to the which are afforded by RFID. While most companies who use barcode perform annual or bi-annual due to the labor intensive process of performing these audits, companies who utilize RFID technology are able to perform nearly daily comprehensive audits which rectify inventories and ensure that shrink is known in real-time.

How will RFID affect my inventory?2016-02-28T00:23:02+00:00

RFID helps companies target inventory purchasing ensuring that they don’t overstock, often requiring price cuts to off-load bloated inventory levels, or understocking which ultimately costs sales and damages customer confidence due to product not being available. Companies using barcode technology typically experience between 10-25% out-of-stocks vs. those companies using RFID see less than 5%. In fact, due to this increased accuracy, typically businesses require 10%-20% less inventory on hand to meet their goals. And improved management decisions lead to better information allowing fewer inventory distortions. Managers in retail for example tend to increase the number of SKU’s per square foot by 10%-50%, deploying thinner stocks and replenishing more frequently.

How will RFID help Increase Sales?2016-02-28T00:20:33+00:00

Due to more targeted inventory purchasing retail businesses using RFID typically experience a 4%-20% increase in sales per location.

How are RFID tags printed?2016-02-28T00:17:42+00:00

RFID tags are printed from a printer–much like any standard label printer. These printers however are RFID enabled which allows them to print the user’s desired text and barcode to the label, while simultaneously encoding the serial number into the tag’s chip.

I’ve heard that RFID doesn’t work around metal and water. Does that mean I can’t use it to track cans or liquid products?2016-02-28T00:16:12+00:00

No. Radio waves bounce off metal and are absorbed by water at ultra-high frequencies. That makes tracking metal products or those with high water content problematic, but good system design and engineering can overcome this shortcoming. Low- and high-frequency tags work better on products with water and metal. In fact, there are applications in which low-frequency RFID tags are actually embedded in metal auto parts to track them.

Will RFID replace bar codes?2016-02-28T00:13:36+00:00

Probably not. Bar codes are inexpensive and effective for certain tasks. It is likely that RFID and bar codes will coexist for many years.

Is RFID new?2016-02-28T00:07:34+00:00

RFID is a proven technology that’s been around since at least the 1970s. Up to now, it’s been too expensive and too limited to be practical for many commercial applications. But if tags can be made cheaply enough, they can solve many of the problems associated with bar codes. Radio waves travel through most non-metallic materials, so they can be embedded in packaging or encased in protective plastic for weather-proofing and greater durability. And tags have microchips that can store a unique serial number for every product manufactured around the world.

Are RFID tags expensive?2016-02-28T00:01:49+00:00

RFID tags have dropped substantially in price since the early 2000’s. The average cost of a single tag was $1.15 in 2001. That price now is .10 cents or less for even the smallest quantity and continues to drop with volume purchases.

If RFID has been around so long and is so great, why aren’t all companies using it?2016-02-27T23:56:02+00:00

Many companies have invested in RFID systems to get the advantages they offer. These investments are usually made in closed-loop systems—that is, when a company is tracking goods that never leave its own control. That’s because all existing RFID systems use proprietary technology, which means that if company A puts an RFID tag on a product, it can’t be read by Company B unless they both use the same RFID system from the same vendor. But most companies don’t have closed-loop systems, and many of the benefits of tracking items come from tracking them as they move from one company to another and even one country to another.

What is the difference between Open Loop and Closed Loop systems?2016-02-27T23:49:54+00:00

Closed Loop systems are systems which data can only be read internally by the users of that system. Open Loop systems allow for data to be shared and read between disparate systems. The standards organization GS1 makers of the UPC provide format guidelines which allow information encoded into the RFID tag to be read across all participating retail platforms.

Go to Top